A non-directional frequency generator spark prevention apparatus including a plurality of electric connections connected with a direct current power source, i.e., brushes, and a commutator for converting direct current waveform inputted through the brushes into alternating current waveform by rotational movement thereof, and for outputting the alternating current waveform. A voltage pulse controlling part is connected between the brushes of the non-directional frequency generator, while having a resistor and a transistor which are connected in series with each other, and the transistor is operated synchronously with the rotation of the commutator of the non-directional frequency generator. By controlling the electric current to flow through the transistor during the brush-off period, a spark production during the brush-off period can be prevented. Further, by controlling the transistor to be turned off during a predetermined period between a predetermined time of the brush-off period to a predetermined time of the brush-on period, the electric current does not flow through the transistor at the beginning of the brush-on period, and accordingly, the spark production at the beginning of the brush-on period is prevented. A corresponding pulse generating part includes a photo-interrupter and a photo sensor, for generating a predetermined pulse waveform corresponding to the rotation of the commutator. Based on the pulse waveform, the transistor is operated, and accordingly, the transistor precisely synchronizes with the rotation of the commutator of the non-directional frequency generator.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A non-directional frequency generator spark prevention apparatus comprising: a non-directional frequency generator having a plurality of electric connections connected with a direct current power source, and a commutator for converting direct waveforms inputted through the electric connections into alternating current waveforms, and for outputting the alternating current waveforms; and a voltage pulse controlling part connected between the respective electric connections of the non-directional frequency generator, for controlling the alternating current waveforms outputted from the non-directional frequency generator by being controlled to have the conducting status of being synchronized with the rotation of the commutator of the non-directional frequency generator.
2. The apparatus as claimed in claim 1, wherein the voltage pulse controlling part comprises a resistor and a transistor which are connected with each other in series.
3. The apparatus as claimed in claim 1, wherein the transistor of the voltage pulse controlling part is controlled by the microcomputer in a manner that the operation time thereof is controlled.
4. The apparatus as claimed in claim 1, wherein the transistor of the voltage pulse controlling part is controlled to be in a conducting status during the brush-off period to prevent a spark production during the brush-off period.
5. The apparatus as claimed in claim 1, wherein the transistor of the voltage pulse controlling part is controlled to be in the non-conducting status during a predetermined period from a predetermined time of a brush-on period to a predetermined time of a brush-off period during which the electric current does not flow through the transistor to prevent a spark production at a beginning of the brush-on period.
6. The apparatus as claimed in claim 1, further comprising a corresponding pulse generating part for generating a predetermined pulse waveform corresponding to the rotation of the commutator of the non-directional frequency generator by being synchronously rotated with the commutator so as to permit the voltage pulse controlling part to synchronously enter into the conducting status corresponding to the rotation of the commutator.
7. The apparatus as claimed in claim 6, wherein the corresponding pulse generating part comprises: a photo-interrupter having a plurality of wings, which is fixed on the motor shaft of the motor of the non-directional frequency generator to be synchronously rotated with the commutator, for generating a pulse waveform corresponding to the rotation of the commutator; and a photo sensor having a light emitting part and a light receiving part in which light from the light emitting part is cut-off or passed by the rotating photo-interrupter so that the light receiving part selectively receives optical pulses, the photo sensor for generating the pulse waveforms corresponding to the optical pulses.
8. The apparatus as claimed in claim 6, wherein the electric connections of the non-directional frequency generator comprise 2n (n=natural number) of input and output terminals for generating alternating current waveforms of (n) period, and the photo-interrupter of the corresponding pulse generating part comprises (n) of wings for generating pulse waveforms of (n) period which synchronize with the alternating current waveforms during one rotation of the commutator.
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February 10, 2000
October 30, 2001
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